Electromagnetic relay or sounder.



No. 806,018. PATENTED NOV. 28, 1905. T. M. ST. JOHN.

ELECTROMAGNETIC RELAY 0R SOUNDER. APPLICATION FILED APE.12,1905.

7 WM mace 3 $07 as g 7 THOMAS M. ST. JOHN, OF NEW YORK, N. Y.

ELECTROMAGNETIC RELAY OR SOUNDER.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed April 12, 1905. Serial No. 255,168-

To a whowt it may concern:

Be it known that I, THOMAS M. ST. JOHN, a citizen of the United States,residing in the borough of Manhattan, city, county, and State of NewYork, have invented certain new and useful Improvements inElectromagnetic Relays or Sounders, of which the following is aspecification.

The object of this invention is to provide a simple and cheap relay orsounder for toy or juvenile telegraphic outfits.

The details of construction are hereinafter set forth.

In the drawings, Figure 1 is a side elevation, partly in section; Fig.2, a plan; Fig. 3, a view of the magnet-core; Fig. 4, a per spectiveview of the iron or steel plate that supports the core and afiords meansof adjusting it. Fi 5 shows a bracket in an ap erture in whie the freeend of the core vibrates, and Fig. 6 shows an adjustable bifurcatedsupport in which the other end of the core is pivotally mounted.

The wood base or sounding board a rests on cross-strips b I), attachedto its under sur face. The core a of the magnet is an ordinary soft-ironheaded bolt upon which are driven flanged brass ferrules 0 0 betweenwhich the insulated wire (1 is wound. The headed end of core ispivotally seated in an eye formed by a folded strip of thin sheet metal6, the ends of which pass through an aperture in the base-board and alsothrough a slot in a washer 6, against the under face of which they arefolded. This arrangement affords capacity for adjustment of the heightat which the end of the core is mounted. The free end of the core playsin an elongated aperture in a bracket f, the upper wall of the a ertureforming the upper or back stop for t e vibrating core. Immediately inrear of the flange 0 the core is supported in a seat or notch in theupturned end of a steel or iron plate secured near its other end to thebaselate by a brass or non-magnetic eyelet h, in which is seated a steelplug a, constituting a stationary magnetic armature and the front orlower stop of the vibrating core, adjacent which the end 9 of the plate9 is turned up into such proximity to the core that the latter will notcome in contact with it when attracted against the armature and stop i.An adjusting-screw j, passing through the baselate, bears upon the ironplate 9 at a suita le distance from its securing-eyelet and aifords byreason of the resiliency of the plate a means of adjustment of thespring tension so applied to the vibrating core. a: y are the terminalsof the winding. As shown, the terminal 00 is connected electrically to ametal hook 7t, eyeleted to the base, and 1 to a contact m, also eyeletedto the base and forming the bottom stop of a Morse key composed of abent piece of sheet metal 11,, having at its free end a knob orhandpiece 0, the other end being eyeleted to the base and the eyeletserving to secure also a metal hook p. The terminal wires of the batteryemployed are in the arrangement shown to be connected to the hooks k p.

I claim as my invention 1. The combination with a vibrating core, havingan appropriate winding, pivotally supported at one end, and front andback stops between which its free end plays, of a resilient plate ofmagnetic material having an upturned end supporting the core adjacentits pivot, and means for raising or lowering such upturned end to adjustthe spring tension applied to the core.

2. The combination of a vibrating core, having an appropriate winding, aresilient plate of magnetic metal having an upturned end supporting thecore between its pivot and winding, means for adjusting such end of theplate to adjust the spring tension applied to the core, a stationaryarmature arranged opposite the core, constituting a front stop thereforand magneticallyinsulated fromv such plate and a back stop for the core.

3. The combination of a base-plate, a vibrating core, having a suitablewinding and pivotally supported at one end upon the base-plate, aresilient plate of magnetic metal having upturned ends secured to thebase plate beneath the free end of the core, one upturned end supportingthe core suitably adjacent its pivot and the other arranged in proximityto the free end of the core but never contacting therewith, a stationaryarmature for the core constituting a front stop therefor andmagnetically insulated from said resilient plate, a back stop for thecore, and means for adjusting the core-supporting end of the resilientplate to adjust the spring tension applied to the vibrating core.

In testimony whereof I have hereunto subscribed my name.

THOMAS M. ST. JOHN. Witnesses EDWARD S. DAVIDSON, L. F. BROWNING.

